One who acts as a wise and faithful guide and monitor, especially of a younger person; an intimate friend who is also a sage counselor, as of one who is young or inexperienced, a wise and trusted guide and advisor, verb_ serve as a teacher or trusted counselor, transitive To act as someone's mentor, intransitive verb_ To serve as a trusted counselor or teacher, especially in occupational settings, To serve as a trusted counselor or teacher to (another person)

Any of the ten successive spiritual teachers who developed Sikhism between the 16th and 18th centuries, A trusted counselor and adviser; a mentor, a recognized leader in some field or of some movement